Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a19154eabe2421…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 13:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47b565f8d311f1b7da46617a21200885 SHA-1: ae00cac4674a7d79a19b2bba247d74e6125d6020 SHA-256: 50a19154eabe24216ef760045853c737d84fa5a6744c6d164b75e346d7d77fd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The numerous external URIs, including links to compromised CMS upload storage and disposable hosting, strongly suggest a link farm or phishing attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=mathematics+for+elementary+teachers+with+activities+pdf PDF link annotation
    • http://jadeite.ru/images/file/88659696809.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wilojuwikoxifupasifofasu.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/sipefavitori.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/13481448074.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850f73d4a3---50284986012.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161357ea49f7b2---68051426592.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bf714d2692813edb0ce4833303ae5f67/didesimabopevo.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/famakojomanudanowotare.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/93280446724.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/88634240977.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f8582637---98514618367.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/38561341496.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51969790947.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zogivujomaw.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/10781031924.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/5852981052.pdfIn PDF document text
    • https://mklaassen.nl/images/file/tativutogotureliradesaje.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/lofosujazod.pdfIn PDF document text
    • http://yibetter.com/data/files/fepitilelomalu.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/vaxozo.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/xexavowuwo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b730dec5---510076378.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/31174292720.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 17808 bytes
SHA-256: 407b0b6c5e782d6e8ca2a0187eda1fae7c475e281d3ae151f306e45fb343903f
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 11144 bytes
SHA-256: a5f79e97c13b8c5b19e875e84dd7b383e6a05f70e7a714aa424d41c5dc154e10

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